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uml: comment early boot locking 

Commentary about missing locking.

Also got rid of uml_start because it was pointless.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-05-06 14:51:26 -07:00 committed by Linus Torvalds
parent 377fad3acb
commit 1d1497e1f9
1 changed files with 13 additions and 9 deletions
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22
arch/um/kernel/um_arch.c
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@ -44,7 +44,7 @@
#define DEFAULT_COMMAND_LINE "root=98:0"
/* Changed in linux_main and setup_arch, which run before SMP is started */
/* Changed in add_arg and setup_arch, which run before SMP is started */
static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
static void __init add_arg(char *arg)
@ -58,7 +58,12 @@ static void __init add_arg(char *arg)
strcat(command_line, arg);
}
struct cpuinfo_um boot_cpu_data = {
/*
* These fields are initialized at boot time and not changed.
* XXX This structure is used only in the non-SMP case. Maybe this
* should be moved to smp.c.
*/
struct cpuinfo_um boot_cpu_data = {
.loops_per_jiffy = 0,
.ipi_pipe = { -1, -1 }
};
@ -119,14 +124,12 @@ const struct seq_operations cpuinfo_op = {
/* Set in linux_main */
unsigned long host_task_size;
unsigned long task_size;
unsigned long uml_start;
/* Set in early boot */
unsigned long uml_physmem;
unsigned long uml_reserved;
unsigned long uml_reserved; /* Also modified in mem_init */
unsigned long start_vm;
unsigned long end_vm;
/* Set in uml_ncpus_setup */
int ncpus = 1;
#ifdef CONFIG_CMDLINE_ON_HOST
@ -140,6 +143,8 @@ static char *argv1_end = NULL;
/* Set in early boot */
static int have_root __initdata = 0;
/* Set in uml_mem_setup and modified in linux_main */
long long physmem_size = 32 * 1024 * 1024;
void set_cmdline(char *cmd)
@ -378,7 +383,6 @@ int __init linux_main(int argc, char **argv)
printf("UML running in %s mode\n", mode);
uml_start = (unsigned long) &__binary_start;
host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt,
set_task_sizes_skas, &task_size);
@ -400,7 +404,7 @@ int __init linux_main(int argc, char **argv)
physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
}
uml_physmem = uml_start & PAGE_MASK;
uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
/* Reserve up to 4M after the current brk */
uml_reserved = ROUND_4M(brk_start) + (1 << 22);